package com.cwz.core.utils.servle;

import com.alibaba.fastjson2.JSON;
import com.cwz.core.constant.Constants;
import com.cwz.core.result.R;
import com.cwz.core.text.Convert;
import com.cwz.core.utils.string.StringUtils;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.util.LinkedCaseInsensitiveMap;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import reactor.core.publisher.Mono;

import javax.servlet.ServletRequest;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;

/**
 * @program: w-demo
 * @description: 客户端工具类
 * @author: Wen
 **/
public class ServletUtils {
	/**
	 * 获取String参数
	 */
	public static String getParameter(String name) {
		return getRequest().getParameter(name);
	}

	/**
	 * 获取String参数
	 */
	public static String getParameter(String name, String defaultValue) {
		return Convert.toStr(getRequest().getParameter(name), defaultValue);
	}

	/**
	 * 获取Integer参数
	 */
	public static Integer getParameterToInt(String name) {
		return Convert.toInt(getRequest().getParameter(name));
	}

	/**
	 * 获取Integer参数
	 */
	public static Integer getParameterToInt(String name, Integer defaultValue) {
		return Convert.toInt(getRequest().getParameter(name), defaultValue);
	}

	/**
	 * 获取Boolean参数
	 */
	public static Boolean getParameterToBool(String name) {
		return Convert.toBool(getRequest().getParameter(name));
	}

	/**
	 * 获取Boolean参数
	 */
	public static Boolean getParameterToBool(String name, Boolean defaultValue) {
		return Convert.toBool(getRequest().getParameter(name), defaultValue);
	}

	/**
	 * 获得所有请求参数
	 *
	 * @param request 请求对象{@link ServletRequest}
	 * @return Map
	 */
	public static Map<String, String[]> getParams(ServletRequest request) {
		final Map<String, String[]> map = request.getParameterMap();
		return Collections.unmodifiableMap(map);
	}

	/**
	 * 获得所有请求参数
	 *
	 * @param request 请求对象{@link ServletRequest}
	 * @return Map
	 */
	public static Map<String, String> getParamMap(ServletRequest request) {
		Map<String, String> params = new HashMap<>();
		for (Map.Entry<String, String[]> entry : getParams(request).entrySet()) {
			params.put(entry.getKey(), StringUtils.join(entry.getValue(), ","));
		}
		return params;
	}

	/**
	 * 获取request
	 */
	public static HttpServletRequest getRequest() {
		try {
			return getRequestAttributes().getRequest();
		} catch (Exception e) {
			return null;
		}
	}

	/**
	 * 获取response
	 */
	public static HttpServletResponse getResponse() {
		try {
			return getRequestAttributes().getResponse();
		} catch (Exception e) {
			return null;
		}
	}

	/**
	 * 获取session
	 */
	public static HttpSession getSession() {
		return getRequest().getSession();
	}

	public static ServletRequestAttributes getRequestAttributes() {
		try {
			RequestAttributes attributes = RequestContextHolder.getRequestAttributes();
			return (ServletRequestAttributes) attributes;
		} catch (Exception e) {
			return null;
		}
	}

	public static String getHeader(HttpServletRequest request, String name) {
		String value = request.getHeader(name);
		if (StringUtils.isEmpty(value)) {
			return StringUtils.EMPTY;
		}
		return urlDecode(value);
	}

	public static Map<String, String> getHeaders(HttpServletRequest request) {
		Map<String, String> map = new LinkedCaseInsensitiveMap<>();
		Enumeration<String> enumeration = request.getHeaderNames();
		if (enumeration != null) {
			while (enumeration.hasMoreElements()) {
				String key = enumeration.nextElement();
				String value = request.getHeader(key);
				map.put(key, value);
			}
		}
		return map;
	}

	/**
	 * 将字符串渲染到客户端
	 *
	 * @param response 渲染对象
	 * @param string   待渲染的字符串
	 */
	public static void renderString(HttpServletResponse response, String string) {
		try {
			response.setStatus(200);
			response.setContentType("application/json");
			response.setCharacterEncoding("utf-8");
			response.getWriter().print(string);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	/**
	 * 是否是Ajax异步请求
	 *
	 * @param request
	 */
	public static boolean isAjaxRequest(HttpServletRequest request) {
		String accept = request.getHeader("accept");
		if (accept != null && accept.contains("application/json")) {
			return true;
		}

		String xRequestedWith = request.getHeader("X-Requested-With");
		if (xRequestedWith != null && xRequestedWith.contains("XMLHttpRequest")) {
			return true;
		}

		String uri = request.getRequestURI();
		if (StringUtils.inStringIgnoreCase(uri, ".json", ".xml")) {
			return true;
		}

		String ajax = request.getParameter("__ajax");
		return StringUtils.inStringIgnoreCase(ajax, "json", "xml");
	}

	/**
	 * 内容编码
	 *
	 * @param str 内容
	 * @return 编码后的内容
	 */
	public static String urlEncode(String str) {
		try {
			return URLEncoder.encode(str, Constants.UTF8);
		} catch (UnsupportedEncodingException e) {
			return StringUtils.EMPTY;
		}
	}

	/**
	 * 内容解码
	 *
	 * @param str 内容
	 * @return 解码后的内容
	 */
	public static String urlDecode(String str) {
		try {
			return URLDecoder.decode(str, Constants.UTF8);
		} catch (UnsupportedEncodingException e) {
			return StringUtils.EMPTY;
		}
	}

	/**
	 * 设置webflux模型响应
	 *
	 * @param response ServerHttpResponse
	 * @param value    响应内容
	 * @return Mono<Void>
	 */
	public static Mono<Void> webFluxResponseWriter(ServerHttpResponse response, Object value) {
		return webFluxResponseWriter(response, HttpStatus.OK, value, HttpStatus.INTERNAL_SERVER_ERROR.value());
	}

	/**
	 * 设置webflux模型响应
	 *
	 * @param response ServerHttpResponse
	 * @param code     响应状态码
	 * @param value    响应内容
	 * @return Mono<Void>
	 */
	public static Mono<Void> webFluxResponseWriter(ServerHttpResponse response, Object value, int code) {
		return webFluxResponseWriter(response, HttpStatus.OK, value, code);
	}

	/**
	 * 设置webflux模型响应
	 *
	 * @param response ServerHttpResponse
	 * @param status   http状态码
	 * @param code     响应状态码
	 * @param value    响应内容
	 * @return Mono<Void>
	 */
	public static Mono<Void> webFluxResponseWriter(ServerHttpResponse response, HttpStatus status, Object value, int code) {
		return webFluxResponseWriter(response, "application/json;charset=UTF-8", status, value, code);
	}

	/**
	 * 设置webflux模型响应
	 *
	 * @param response    ServerHttpResponse
	 * @param contentType content-type
	 * @param status      http状态码
	 * @param code        响应状态码
	 * @param value       响应内容
	 * @return Mono<Void>
	 */
	public static Mono<Void> webFluxResponseWriter(ServerHttpResponse response, String contentType, HttpStatus status, Object value, int code) {
		response.setStatusCode(status);
		response.getHeaders().add(HttpHeaders.CONTENT_TYPE, contentType);
		R<?> result = R.fail(code, value.toString());
		DataBuffer dataBuffer = response.bufferFactory().wrap(JSON.toJSONString(result).getBytes());
		return response.writeWith(Mono.just(dataBuffer));
	}

	/**
	 * @Description: 设置 response 返回
	 * @Author: Wen
	 * @param response:	HttpServletResponse
	 * @param value:	响应内容
	 * @param code:		响应状态码
	 * @return: void
	 **/
	public static void outResponse(HttpServletResponse response, Object value, int code) {
		ObjectMapper mapper = new ObjectMapper();
		response.setStatus(HttpStatus.OK.value());
		response.setContentType("application/json;charset=UTF-8");
		try (PrintWriter writer = response.getWriter()) {
			R<?> result = R.fail(code, value.toString());
			mapper.writeValue(writer, result);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}
